Grand Seiko Evolution 9 Ushio 300 Diver Blue
SLGB023
- Case
- 40.8mm
- MSRP
- $12,400
- Movement
- Spring Drive
- Reserve
- 72h
VS
Building 1v1 comparison
Building 1v1 comparison
1v1 Watch Comparison
A focused side-by-side page for specs, fit, movement details, review notes, and enthusiast context.
SLGB023
217.30.42.21.01.001
Pair Review
Built from the saved specs and wearability notes for these two watches, then weighed against enthusiast priorities like fit, movement quality, practicality, finishing, value, and collector appeal.
Where it wins
Enthusiasts who prioritize movement innovation and extreme timekeeping precision
Where it wins
Collectors who want stronger dive-tool credibility and higher water resistance
Omega uses the automatic Caliber 8912, with 39 jewels, 3.5 Hz / 25,200 vph, 60 hours of power reserve, METAS certification, and 15,000 gauss magnetic resistance. That gives it a strong technical profile and a clear anti-magnetic advantage, with the added reassurance of Omega’s modern Master Chronometer ecosystem. Grand Seiko uses the Spring Drive Caliber 9RB1, with 33 jewels, 72 hours of power reserve, and an accuracy claim of ±20 seconds per year, which is the standout spec in the pair and a major enthusiast draw. The GS movement is the more sophisticated and distinctive choice in terms of horology, while the Omega is the more explicitly tool-oriented one with stronger listed magnetic resistance and certification. Winner: Grand Seiko
The Omega measures 42 mm across, 13.79 mm thick, with a 47.5 mm lug-to-lug and 177 g on the steel bracelet. The pre-existing wearability notes describe it as a big improvement over earlier Planet Oceans, with a slimmer profile, better-balanced bracelet, and less top-heavy feel, though it still wears substantial and more assertive than a Submariner or Fifty-Eight. The Grand Seiko is slightly smaller at 40.8 mm, thinner at 12.9 mm, but has a longer 48.5 mm lug-to-lug; importantly, it is much lighter at 122 g thanks to high-intensity titanium. Its wearability notes emphasize that it feels noticeably slimmer and lighter than earlier GS divers, and that the updated bracelet and micro-adjust clasp make it one of the most comfortable luxury divers in class. On pure wrist comfort and ease of all-day wear, the GS has the edge, especially for smaller wrists or anyone sensitive to weight. The Omega still offers a strong presence and may suit those who prefer a more substantial steel diver. Winner: Grand Seiko
The Omega’s black dial, ceramic bezel, domed sapphire, and Super-LumiNova create a classic, stealthy dive-watch look with very strong utility. It also offers 600 m water resistance, a screw-in crown, helium escape valve, and a steel bracelet with comfort setting and diver extension, making it the more extreme and overtly capable daily sports watch. The Grand Seiko counters with a textured blue Ushio gradient dial, LumiBrite, sapphire with inner AR, and 300 m water resistance; its dial is likely the more visually rich and distinctive of the two, while the Spring Drive seconds hand adds everyday charm. However, the Omega is better equipped for hard-use diving, while the GS is more than adequate for most real-world water use and offers superior visual refinement. For pure daily practicality and tool credibility, the Omega wins; for dial artistry and smooth, low-friction daily enjoyment, the GS is very compelling. Winner: Omega
The Omega has the lower MSRP at $9,200 versus $12,400 for the Grand Seiko, and it also carries stronger mainstream utility signals: METAS certification, 600 m water resistance, helium escape valve, and a transparent caseback on a modern Omega dive platform. The Grand Seiko’s value case is different: it offers a Spring Drive movement with exceptional stated accuracy, high-intensity titanium, a highly distinctive dial, and the Evolution 9 design language, which is especially appealing to movement and craftsmanship enthusiasts. Ownership practicality favors the Omega slightly because it combines lower entry price with robust dive specs and a well-established modern tool-watch identity. Collector appeal depends on taste: the GS is more niche and horologically interesting, while the Omega has broader recognition and a more straightforward proposition. Winner: Omega
Compared
SLGB023
217.30.42.21.01.001